Year	kt
1990	1933.9
1991	1919.1
1992	2235.4
1993	2198.7
1994	2525.4
1995	2652.7
1996	2816.6
1997	3020.1
1998	3519.2
1999	3541.6
2000	3768
2001	3925.5
2002	4062.9
2003	4562.7
2004	4531.9
2005	4338.7
2006	4547.6
2007	4696.3
2008	4503
2009	4394.5
2010	4513.2
2011	4766.2
2012	4686
2013	4473.3
2014	4758.6
2015	5286.7
2016	5410.7
2017	5428.9
2018	5024.8
2019	5131.9
2020	4582.2